Sensitive safety-print and process.



H. W.'F. LORENZ. SENSITIVE S ETY PRINT AND PROCESS. APPLICATION FILED NOV. 17, 1909.

Patented Aug. 16; 1910.

Maw/M HENRY W. F. LORENZ, OF JERSEY CITY, NEW JERSEY.

SENSITIVE SAFETY-PRINT AND PROCESS.

. Specification of Letters iatent.

Patented Aug. 16, 1910.

Applicationflled November 17, 1909. Serial No. 528,565.

T 0 all whom it mag concern:

Be it known that I, HENRY W. F. LORENZ, a citizen of the United States, and a resident of the city of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and Improved Sensitive Safety-Print and Process, of which the following is a clear, full, and exact description.

This invention relates to the manufacture of sensitive safety prints such as are intended to be used for checks, letters of credit, bank notes, postage stamps, revenue stamps, bonds, stock certificates, and the like security papers.

In my application No. 490,386 I have disclosed a sensitive safety print and process for making the same. The chief characteristic in the cited application is that a soluble, chemically sensitive, coloring matter in the finished print is converted into a waterinsoluble coloring matter. Furthermore, I have disclosed also the fact that, in the case of a printing ink for engraved plates, an ink base like blanc fixe, sublimed lead, etc., should preferably be present to give the ink proper working qualities.

In the present application I disclose and claim a sensitive safety print and process in which, first, an insoluble as well as a soluble sensitive coloring matter can be fixed firmly and insolubly upon the paper surface in the finished print. Secondly, larger quantities of an ink base, like blanc fixe, lime carbonate.

(paris white), etc. can be used. This also is a desideratum in many cases.

In carrying out my invention I make use of the following substances, or proper combinations of the same. A water soluble sensitive color (direct dyeing-cotton col0rs,basic colors, etc), or an insoluble sensitive color or color lake. (A colorless sensitive substance, soluble or insoluble, sensitive to dilute reagents, e. 9., phenolphthaleine, etc., may be added to the color, or colors, used; or it may be employed by itself, 6 e. in this case we would obtain a colorless sensitive ink.) An ink base, or ink bases, like blanc fixe, etc, lime carbonate, starch or other substance suitable for a like purpose. ink vehicle containing, as principal ingredient, a coagulable substance, e. g., albumen, casein, gelatin, or like substance.

Reference is to be had to the accompanyspecification.

Figure 1 represents a check which is made according to my invention, being printed with my special sensitive ink. Fig. 2

r steaming box, into which steam enters at (B) and passes out at (A). (C) represents a removable glass door through which can be seen the check v(D) being subjected to steam vapor.

To carry out my invention I may proceed in several Ways, depending principally upon the nature of the coagulable substance employed in the ink. For instance when using albumen, I prefer to proceed as follows:

Albumen vehicle, parts of egg albumen with 20 parts of water. Let stand, stirring occasionally, until a homogeneous-mass is obtained. To 25 parts of the latter add 20 parts of glycerin and stir until the same is mixed thoroughly. This varnish can be thinned with more glycerin, if desired.

Examples of various inks containing this vehicle:

S 81 Take mimosa Y. C. (Geigy) C, H,,N

25 parts and dissolve 1n glycer 1n, 56 parts. Add to this mixture paris white, parts. Bring the resultant pasty mass upon the ink mill and grind thoroughly. Now add albumen varnish, 90 parts. Pass repeatedly through the mill, thinning with glycerin until about 48 parts of the latter have been used, when the ink will be found to havethe right consistency for printing. Make a print gradually bleached.

ing drawings which form a part of this ZZho'ws a simple form of closed receptacle,

.90 and expose tosteam vapor. Color of print: yellow. Reactions: solutions (4) Invisible ink. Phenolphthaleine, 20 parts; albumen varnish, 25 parts. Reactions: solutions of alkalies: red.

- (5) Congo red, 10. (C H N O S Na paris white, 80; albumen varnish, 90; glycerin, 80; .color: red. Reactions: solutions ofoxalic acid: blue; alkalies: red-brown, soluble; bleaching powder: red, slowly bleached.

It will be noted that instead of the albumen varnish similar varnishes of a coagu-' lable nature can be used; for instance a casein varnishz casein dissolved in a borax solution with addition of glycerin; or a gelatin varnish can be employed: gelatin dissolved in water with addition of glycerin. The gelatin contained in an ink made with this vehicle can be coagulated by exposing the print to steam vapor containing formaldehyde vapors.

For a plate ink it is advisable to add a percentage of gum tragacanth or gum trion paper, which consists in taking a soluble,

chemically sensitive coloring matter capable of being converted into a water insoluble body, adding a water soluble vehicle contaming a coagulable substance as principalingredient, printing therewith and exposing the print to steam Vapor.

2. The process of making a sensitive print on paper which consists in taking a soluble, chemically sensitive coloring matter capable of being converted into a water insoluble body, addin an inert base and a water soluble vehic e containing a coagulable subprinting to steam 4. The-process of making a sensitive print on paper which consists in taking a chemically sensitive, insoluble, coloring matter, adding a water soluble vehicle containing a coagulable substance as principal ingredient, and an inert ink base, and exposing the print to steam vapor.

5. The process of printing" on paper with a chemically sensitive ink containing a coagulable substance as one of the ingredients, and fixing the ink on the paper by coagulating said coagulable substance.

6. As a new article of manufacture, a safety print formed of a suitable carrier having thereon an ink base, a coagulable substance and a chemically sensitive waterinsoluble substance incorporated in said ink base.

7. A sensitive safety print comprising a paper body adapted to receive writing ink pr nted with a coagulable printing ink embodying therein, as principal ingredients, a coagulable substance and chemically sensitive color pigments varying in quantity, to prevent the removal of writing ink without destroying, or changing the color, of said color pigments.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY W. F. LORENZ.

Witnesses:

W INNEs, MARIE LORENZ. 

